大跨拱形结构等效静力风荷载

基于计算流体动力学(CFD)方法和有限元动力时程分析法,数值模拟脉动风特性,获取脉动风速时程,以此作为数值风洞模拟的入口边界条件.运用FLUENT软件对大跨拱形结构进行脉动风作用下结构的非稳态分析,得到作用于结构的时程风压荷载;运用ANSYS分析软件进行结构的风振响应计算,分析获得了基于结构风振响应时程的等效静力风荷载.提出多目标等效静力风荷载加权组合系数的定义,计算获得了大跨拱形结构的多目标等效静力风荷载,并验证了其计算精度.研究结果表明,在基于该方法所得等效静力风荷载作用下,结构静力响应计算结果与风振动力时程响应极值吻合.

Equivalent Static Wind Loads on Large Span Arched Structures

Abstract： Based on computational fluid dynamics (CFD) and the finite element dynamic time history analysis method, the time history speed of fluctuating wind was simulated by using the numerical method which was used as inlet boundary condition of numerical wind tunnel. Then, non steady state analysis on a large span arched structure was made by using the FLUENT software to get the time history wind loads. Meanwhile, the wind induced vibration response was analyzed using the ANSYS software. After that, equivalent static wind loads (ESWL) based on time history response were obtained and the definition of multi objective ESWL combination factors was proposed. Finally, the multi objective ESWL of the open large span arched structure were obtained with their accuracy verified. The study shows that the static response values under ESWL and extreme response values in dynamic analysis are in good agreement.